ITALY - JANUARY 19:  Leonardo da Vinci's autoportt and Giorgio Vasari, the Renaissance painter and architect, referred to Leonardo's use of rooms in the monastery in his 16th-century "Lives of the Artists". "It was during this period that the artist probably at least made the acquaintance of the sitter of the Mona Lisa, before possibly painting her later," researchers said in Florence, Italy on January 19th, 2005.  (Photo by Eric VANDEVILLE/Gamma-Rapho via Getty Images)